How To Fix SDBALM088 - Hit rate of the catalog cache in %

SAP Error Message - Details

• Message type: E = Error

• Message class: SDBALM - SAP DB and liveCache Alert Monitoring

• Message number: 088

• Message text: Hit rate of the catalog cache in %

Description
The system calculates and displays the hitrate since the last run of
the data collector. In the case of the first run of the data collector
after a restart of the instance or after the Alert Monitor is started,
the system does not display a hitrate.
Data Collector
<ZH>Collector B</>
(RZ20 -> SAP CCMS Technical Experts Monitors -> All Monitoring Contexts
,,-> <Name of the database connection> -> Collectors and Internals
-> Collectors -> Collector B)

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Preset runtime interval of Collector B: 15 minutes

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SDBALM088 - Hit rate of the catalog cache in % ?

  The SAP error message SDBALM088 indicates that the hit rate of the catalog cache is below a certain threshold, which can lead to performance issues in the database. This message is part of the database performance monitoring in SAP systems, particularly in relation to the database's ability to efficiently retrieve data.
  Cause:
  The catalog cache is used to store metadata about database objects (like tables, indexes, etc.) to speed up access to this information. A low hit rate in the catalog cache can be caused by several factors, including:
  
  High Volume of Metadata Requests: If there are many requests for metadata that are not being cached effectively, the hit rate will drop.
  Insufficient Cache Size: The cache may not be large enough to hold all the necessary metadata, leading to frequent cache misses.
  Frequent Changes to Database Objects: If database objects are frequently created, altered, or dropped, this can invalidate cached entries and lead to a lower hit rate.
  Database Configuration Issues: Incorrect configuration settings for the database or the cache itself can lead to suboptimal performance.
  
  Solution:
  To address the SDBALM088 error, consider the following solutions:
  
  Increase Cache Size: If the cache size is too small, consider increasing it to accommodate more metadata. This can often be done through database configuration settings.
  Optimize Database Design: Review the database design and usage patterns to minimize unnecessary metadata requests. This may involve consolidating tables or optimizing queries.
  Monitor and Tune Performance: Use database monitoring tools to analyze performance and identify bottlenecks. Adjust configurations based on the findings.
  Regular Maintenance: Perform regular database maintenance tasks, such as updating statistics and rebuilding indexes, to ensure optimal performance.
  Review Application Logic: Ensure that the application logic is not causing excessive metadata requests. Optimize the way the application interacts with the database.
  
  Related Information:
  
  Database Documentation: Refer to the specific database documentation (e.g., SAP HANA, Oracle, etc.) for detailed instructions on cache management and performance tuning.
  SAP Notes: Check SAP Notes for any known issues or patches related to catalog cache performance.
  Performance Monitoring Tools: Utilize SAP's performance monitoring tools (like ST03N, ST04) to analyze workload and identify areas for improvement.
  Consult SAP Support: If the issue persists, consider reaching out to SAP support for further assistance and guidance tailored to your specific environment.
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the hit rate of the catalog cache and enhance overall database performance.